Tensioning apparatus for material rolls



June 28, 1938.- w. E. C'RIST, JR 2,121,902

TENSIONING APPARATUS FOR MATERIAL ROLLS I Filed Nov. 19, 1956 'IIIIIIIIIIIIIA a fPatented Junef28, 1938.- i i I Application November 1 V Claims.

7 This "inventi'on relatesto 'an {apparatus for maintaining a tension upon" material-being un- -.wound.;from a --reel, such for instance as upon a .IOIli-O'f paper-which is being fed to aprinting 7 5 :presspfor'which purpose it is particularly adapted.

a .;.-..!Ihe' solziii'ect o'f'theinvention'isto pf'oVide an --apparatus:.for the purpose specified which will be simple-sin: construction and effective'in operation. -In the accompanying drawing: I

:bodying my improvemenatogether with a portion 7 xzof ithe zi'rarne ofa'printingpress- :Figx12v is a .view of the-rear end of thief-parts .ishown' 'inil ig. 1,. some 'of the- 'p'arts being broken Fig'.'3lis a section on the line 3 .3t-of Fig.2 f 4 is a'section on:the'line-4-4 of Fig.- 2. "Fig. '5;is.a.'section on:the line' 5;-5 of Fig. 2.

Fig. 6 is a section on the line E6 of Fig. 5, Figfl -isatop plummet-or a part of the mechanism. I

imo

' In the present case I haveshown my apparatus applied to a printingpress. The parts of the apparatus are all supported from the press frame, I indicating parts of the rear portion of the press frame and 2-are' arms which extend rearwardly from vthe frame members I. The roll of paper indicated at 3 is carried upon a shaft 4 in the usual manner, the roll of paper having the usual hollowiron core (not shown) and the shaft 1; having adjustable cones which engage with the ends of the iron core, one only of these cones, 5, beingshown. T V

p In order to apply a tension to the roll of paper so that the web 3" thereof may be kept taut there is employed a series of soft rubber rollers 6" mounted upon shafts I rotatably supported by a long bracket 8, the rollers being of the full width of the paper. Therollers are arranged in fric- 0 tional engagement with the paper by a series of springs having their inner ends connected to the bracket 8 by bolts l0 and washers II and having their rear ends connected to a backing plate [2,

' preferably of'sheet metal, which is formed on the arc of a circlewhose center is the center of the paper] roll, the springs being connected to this backing l2 by'hook bolts i3, three series of rollers and springs being employed in the present instance; The length of the backing plate i2 is 1 slightly greater than'that of the width of the roll of paper to insure applying pressure-upon the ,roll of paper near the edges thereof.-

pins l4, four of these pinsbeing shown in the a I f2j*,121,902 ,TENSIONINGIAPPARATUS Folk-MATERIAL r sip-Romss William cast; Jr.,"spiin ne1a; "ohi'o -..nFig; 1- :is a sidel'elevation of an apparatus em-- springs 9 preferably conical spiral in form; these The backing plate I2 is supported by aseries of PA EN 9,a1 9ss,.sei-ia1... n 11-1 ;5ss C e -15 ;"1. T. present instance. These pins are carried by -bracketsl 5 which' are connected withthe press frame members by bolts as-shown in FigJ'Z.

ii" on.

For eachofthe pins l4 the'backingplateli2fis ."f V

providedwith a sleeve 16 eachofwhich 'slides b upon its correspondingmin, these s'leevesubein'g connected to the ba'cking -pre'ferably by welding. As. the" roll of-paper decreases in size the rollers Rurge'd by the springs are kept -in:contactwith I the paper due to the elongation of thesprings, 10

the inward movement of l-these-rollers '6 beinglimited by adjustable stops in the nature'of: nuts I 1 threaded on rods 1 8' which "extend loosely through the backing plate and are connected with-the brackets 8, two of these stops being provided :for 1 5 each roller. s r i "In order to withdraw the rollers and :their springs to permit the installation of a 'new roll of paper there is provided a pair of screws I 9, the

inner ends of which-are'rotatably connected with 'zo the backing plate i2 as shown best in Fig: 6 each screw havinga plain reduced-inner" end which passes looselythrough the backing plate and has on each side thereof-a collar 20. Each ofthese screws is threaded in a bracket 2| which brackets are bolted to the press frame members I, and the outer end of each screw is provided with a hand wheel 22. When the screws are rotated in one direction by these hand wheels, the backing plate, springs and rollers may be withdrawn a suflicient distance to allow the insertion of a new roll of paper upon the shaft 4.

Provision is made for retarding a too free rotation of the shaft 4 which carries the paper roll by means of brake shoes 23 which cooperate with brake pulleys 24 which are secured to the shaft. As is the usual practice one of these grooved I pulleys is removable so that the roll of paper with its hollow core may be slipped onto the. shaft 4. Each of these brake shoes is pivotally connected with a threaded rod 25 the upper end of therod a hook engagement with a pin 21 which is connected and projects laterally from the arms 2 of the press frame. A hand wheel 28 has a threaded engagement with each one of the rods and each bearsagainst its corresponding sleeve 26 so that when the Wheels are turned in either direction the frictional engagement of the brake shoes 23 with the grooved pulleys may be increased or diminished.

As before explained, the rollers 6 remain 'inv engagement with the paper roll until arrested by the stops" l'l. These stops are designed to act before the paper. is -exhausted and at that time,

being slidably mounted in a sleeve 26 which has 7 the tension of the paper, to maintain the tautness of the web, will be maintained by the brake shoes 23 without wrinkling; these brake shoes being sufficient for that purpose due to the decreased size of the paper roll.

It should be explained that when the roll of paper is exhausted the shaft 4 is removed from the open bearings 29 in which it is mounted, slipped into the hollow metal core of a new roll of paper and then replaced in the bearings, the hook connection of the sleeves 26 on the studs 21 permitting them to be readily removed from the studs for that purpose.

Before a new roll is inserted, however, the backing plate I2 and the rollers 6. and springs which it carries are retracted in the manner before explained.

In order to keep the upper roller 6 back of the point where the web 3 leaves the paper roll, the web is passed about an idler roller 2" at the rear end of the arms2.

' By the apparatus described, if the roll of material is Wound absolutely straight at the factory, as it almost invariably is, the roll of material will unwind straight and'will be fed accurately to the press, thus avoiding wrinkling of the paper, avoid breakage due to too much tension of the brake shoes on the roll of paper, will cause the paper to be kept in proper registry with the printing plates of the press, and will cause the knives of the press to cut the paper at the proper marginal points.

Having thus described my invention, I claim:

1. Ina tensioning apparatus for a rollof material during unwinding thereof, a roller, means for supporting the same, a backing plate, a series of springs between said supporting means and backing plate to hold said roller in resilient engagement with the outer surface of the material roll, and means to withdraw said backing plate, roller and springs to permit the insertion of a fresh roll of material.

2. In a tensioning apparatus for a roll of material'during unwinding thereof, a roller, means for supporting the same, 'a backing plate, a series of springs between said supporting means and backing plate to hold said roller in resilient engagementwith the outer surface of the material roll, and means to withdraw said backing plate, roller and springs to permit the insertion of afresh roll of material, said withdrawing means consisting of at least two threaded rods swivelly connected with said backing plate and having a threaded engagement with a fixed part together with means for turning said rods.

3. In a tensioning apparatus for a roll of ma- :terial during unwinding thereof, a device to engage said roll, a bracket for supporting the same, a backing plate, springs between said backing plate and bracket, and means for slidably supporting said backing plate from a fixed part.

4. In a tensioning apparatus fora roll of material during unwinding thereof, a device to engage said roll, a bracket for supporting the same,

a backing plate, springs between said backing plate and .bracket, and means forislidably supporting said backing plate from a fixed-part, said means consisting of pins on said fixed part and sleeves connected with said backing, plate slidably mounted upon said pins.

5. In a tensioning apparatus for a roll of ma WILLIAM E. CRIST, JR. 

